john has a bike when john gets on the bike, the force on each tyre increases.

what happens to the area of tyre in contact with the road?

also one of the tyres has a slow puncture and the air pressure in the tyre falls.

what happens to the area of tyre in contact with the road?

answer please

When John gets on the bike and exerts a force on the pedals, it causes the bike to move forward. As a result, the force on each tire increases, since the tires need to provide enough friction with the road to propel the bike.

As the force on the tire increases, it compresses the tire slightly, causing the contact area between the tire and the road to decrease. Imagine exerting force on a sponge; when you press down on it, the area of contact between the sponge and your hand decreases. Similarly, when more force is exerted on the tires of the bike, the area of contact with the road decreases.

This happens because the tire flattens out slightly under the increased force, which reduces the overall size of the contact patch. The contact patch is the area of the tire that is actually touching the road surface. Therefore, when the bike is in motion and experiencing an increased force on the tires, the area of the tire in contact with the road decreases.